From patchwork Tue May 18 06:42:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claire Chang X-Patchwork-Id: 12263823 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DDA77C433B4 for ; Tue, 18 May 2021 06:44:26 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9BC2D60240 for ; Tue, 18 May 2021 06:44:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9BC2D60240 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.128782.241754 (Exim 4.92) (envelope-from ) id 1litSl-0008Kf-Q8; Tue, 18 May 2021 06:44:19 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 128782.241754; Tue, 18 May 2021 06:44:19 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1litSl-0008KW-LA; Tue, 18 May 2021 06:44:19 +0000 Received: by outflank-mailman (input) for mailman id 128782; Tue, 18 May 2021 06:44:18 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1litSk-0008HI-Hl for xen-devel@lists.xenproject.org; Tue, 18 May 2021 06:44:18 +0000 Received: from mail-pf1-x42f.google.com (unknown [2607:f8b0:4864:20::42f]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 1a22553b-ddbd-4efe-9be4-3340206f65f4; Tue, 18 May 2021 06:44:17 +0000 (UTC) Received: by mail-pf1-x42f.google.com with SMTP id c17so6684729pfn.6 for ; Mon, 17 May 2021 23:44:17 -0700 (PDT) Received: from localhost ([2401:fa00:95:205:f284:b819:54ca:c198]) by smtp.gmail.com with UTF8SMTPSA id a7sm11612338pfg.76.2021.05.17.23.44.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 17 May 2021 23:44:16 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 1a22553b-ddbd-4efe-9be4-3340206f65f4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=XERRPmZD9LZ8NlvTKf69Ki0Z3JOqJsfzsMjeGM/hmyc=; b=oT5AI3WxhLeqEGvrMWNth5ilokIoDf3aUpAY7upThFXBQOnHIqoXsdqVxmKsJ2ibAV p2tS4tJqThBqZvPuEA86u4i7tHwUvgMMmS6jwMmWzqazAKGD8hQRrm4uJZAQme8fQgO7 xMpoBHann0anuHkotadEJq5SA2Uh6yM8s5FoE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=XERRPmZD9LZ8NlvTKf69Ki0Z3JOqJsfzsMjeGM/hmyc=; b=YnKdsB1K9uz01vDSSSuO8X2bf/5d7jqSYCcM5TdGp82p/h/ZOfJgiAG/wIfvHdu8fo YMZKmIVk9cpOMcvVtz+g3GEry02QwKIYaK6MIePi5/vUshP9q1KMQDn8QcRXDbg4eLnx SnAzmyNjxXYArM1e15llU1MtB6HkRA3j2LpEAxKztZOBY9oXJ7QDwhwEbQRFihU1k/Pl qA9r5gw5VYg//AS/4irAp4vNeaDxGbZJErLgsaExOd4mkh73LKhHDDA/YV8iAqOHGqCt mivzwAevWfQje0IoQoBo7dzNu7lQsG3mkID4DmgvQUajYK34TMjz/sA0EPwGhHWrgbp+ CyDA== X-Gm-Message-State: AOAM531Kb4rqG5bcZ2fdMMFptAPTtG2AfOihKyynRZXEJ/QrTTpYeeyE 7Beut9148W+TtGhvA+f0DQG8/g== X-Google-Smtp-Source: ABdhPJyi8T1bUdRh2weFxzn5qV51jHdwUH18sdVlzVJRpz5+Czvdmvjaq4flIajQeG3jnSiA7cCp7w== X-Received: by 2002:a05:6a00:15d4:b029:2de:a538:c857 with SMTP id o20-20020a056a0015d4b02902dea538c857mr438129pfu.51.1621320256584; Mon, 17 May 2021 23:44:16 -0700 (PDT) From: Claire Chang To: Rob Herring , mpe@ellerman.id.au, Joerg Roedel , Will Deacon , Frank Rowand , Konrad Rzeszutek Wilk , boris.ostrovsky@oracle.com, jgross@suse.com, Christoph Hellwig , Marek Szyprowski Cc: benh@kernel.crashing.org, paulus@samba.org, "list@263.net:IOMMU DRIVERS" , sstabellini@kernel.org, Robin Murphy , grant.likely@arm.com, xypron.glpk@gmx.de, Thierry Reding , mingo@kernel.org, bauerman@linux.ibm.com, peterz@infradead.org, Greg KH , Saravana Kannan , "Rafael J . Wysocki" , heikki.krogerus@linux.intel.com, Andy Shevchenko , Randy Dunlap , Dan Williams , Bartosz Golaszewski , linux-devicetree , lkml , linuxppc-dev@lists.ozlabs.org, xen-devel@lists.xenproject.org, Nicolas Boichat , Jim Quinlan , tfiga@chromium.org, bskeggs@redhat.com, bhelgaas@google.com, chris@chris-wilson.co.uk, tientzu@chromium.org, daniel@ffwll.ch, airlied@linux.ie, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, jani.nikula@linux.intel.com, jxgao@google.com, joonas.lahtinen@linux.intel.com, linux-pci@vger.kernel.org, maarten.lankhorst@linux.intel.com, matthew.auld@intel.com, rodrigo.vivi@intel.com, thomas.hellstrom@linux.intel.com Subject: [PATCH v7 12/15] swiotlb: Add restricted DMA alloc/free support. Date: Tue, 18 May 2021 14:42:12 +0800 Message-Id: <20210518064215.2856977-13-tientzu@chromium.org> X-Mailer: git-send-email 2.31.1.751.gd2f1c929bd-goog In-Reply-To: <20210518064215.2856977-1-tientzu@chromium.org> References: <20210518064215.2856977-1-tientzu@chromium.org> MIME-Version: 1.0 Add the functions, swiotlb_{alloc,free} to support the memory allocation from restricted DMA pool. Signed-off-by: Claire Chang --- include/linux/swiotlb.h | 4 ++++ kernel/dma/swiotlb.c | 35 +++++++++++++++++++++++++++++++++-- 2 files changed, 37 insertions(+), 2 deletions(-) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index 0c5a18d9cf89..e8cf49bd90c5 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -134,6 +134,10 @@ unsigned int swiotlb_max_segment(void); size_t swiotlb_max_mapping_size(struct device *dev); bool is_swiotlb_active(struct device *dev); void __init swiotlb_adjust_size(unsigned long size); +#ifdef CONFIG_DMA_RESTRICTED_POOL +struct page *swiotlb_alloc(struct device *dev, size_t size); +bool swiotlb_free(struct device *dev, struct page *page, size_t size); +#endif /* CONFIG_DMA_RESTRICTED_POOL */ #else #define swiotlb_force SWIOTLB_NO_FORCE static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr) diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index cef856d23194..d3fa4669229b 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -457,8 +457,9 @@ static int find_slots(struct device *dev, phys_addr_t orig_addr, index = wrap = wrap_index(mem, ALIGN(mem->index, stride)); do { - if ((slot_addr(tbl_dma_addr, index) & iotlb_align_mask) != - (orig_addr & iotlb_align_mask)) { + if (orig_addr && + (slot_addr(tbl_dma_addr, index) & iotlb_align_mask) != + (orig_addr & iotlb_align_mask)) { index = wrap_index(mem, index + 1); continue; } @@ -704,6 +705,36 @@ late_initcall(swiotlb_create_default_debugfs); #endif #ifdef CONFIG_DMA_RESTRICTED_POOL +struct page *swiotlb_alloc(struct device *dev, size_t size) +{ + struct io_tlb_mem *mem = dev->dma_io_tlb_mem; + phys_addr_t tlb_addr; + int index; + + if (!mem) + return NULL; + + index = find_slots(dev, 0, size); + if (index == -1) + return NULL; + + tlb_addr = slot_addr(mem->start, index); + + return pfn_to_page(PFN_DOWN(tlb_addr)); +} + +bool swiotlb_free(struct device *dev, struct page *page, size_t size) +{ + phys_addr_t tlb_addr = page_to_phys(page); + + if (!is_swiotlb_buffer(dev, tlb_addr)) + return false; + + release_slots(dev, tlb_addr); + + return true; +} + static int rmem_swiotlb_device_init(struct reserved_mem *rmem, struct device *dev) {